kevinlinxc

from PIL import Image, ImageDraw, ImageFont
import cv2
import numpy as np

def get_bounding_rect_area(contour):
    # calculate area using the minimum bounding rectangle instead of whatever cv2.contourArea does
    rect = cv2.minAreaRect(contour)
    width = rect[1][0]
    height = rect[1][1]
    return width * height

kevinlinxc

import cv2
import numpy as np


def nothing(x):
    pass


# Create a black image, a window
img = np.zeros((300, 512, 3), np.uint8)

kevinlinxc

import serial
import serial.tools.list_ports

def get_ports():
    """
    Get a list of available serial ports.
    Returns:
        List of serial ports, or None if no ports are available.
    """
    serial_ports = serial.tools.list_ports.comports()

kevinlinxc

"""Calculate the difference between two GPS coordinates using the Haversine formula"""
from math import radians, cos, sin, sqrt, atan2


def haversine(coord1, coord2):
    # Radius of the Earth in kilometers
    R = 6378.137

    # Converting coordinates from degrees to radians
    lat1, lon1 = radians(coord1[0]), radians(coord1[1])

kevinlinxc

"""
This simple helper script auto-detects the Arduino port.
Saves time because you don't need to check the Arduino IDE/device manager to get the port number each time.
"""
import serial.tools.list_ports


def get_port():
    """
    Get the port name of a connected Arduino if one is connected.

kevinlinxc

import cv2
import numpy

# make a video where each frame is the frame number

writer = cv2.VideoWriter("frame_numbers.mp4", cv2.VideoWriter_fourcc(*"mp4v"), 30, (1920, 1080))

for i in range(6572):
    frame = numpy.zeros((1080, 1920, 3), dtype=numpy.uint8)
    cv2.putText(frame, str(i), (500, 500), cv2.FONT_HERSHEY_SIMPLEX, 10, (255, 255, 255), 2)

kevinlinxc

# pip install pygeodesy
import pygeodesy.sphericalNvector


def intersection_point(lat_long_1, bearing_1, lat_long_2, bearing_2):
    vector1 = pygeodesy.sphericalNvector.LatLon(*lat_long_1)
    vector2 = pygeodesy.sphericalNvector.LatLon(*lat_long_2)
    return vector1.intersection(bearing_1, vector2, bearing_2)

kevinlinxc

Diffing PDFs

Recently, I wanted to find the textual differences between two PDFS, in the same way that you would compare plain text files with Git/GitHub. I wanted the nice side-by-side view too, not just the Git diff terminal output.

Edit: After writing this gist, I realized that https://www.diffchecker.com/pdf-compare/ pretty much does what I want. This was still a fun experiment though.

I tried a few different ways of extracting the text (Tesseract OCR, Copy and Pasting all the text), but eventually I found the best solution for me was a tool called textract, which uses pdftotext under the hood. This did the best job, as it didn't have weird misread symbols like OCR and it didn't have extra nonsense copied by C/P.

kevinlinxc

2024 Collegiate Design Series
SAE Aero Design Rules

Version 2024.0

i

Forward
Welcome to SAE Aero Design 2024! This competition has been affording students with
relevant aircraft design challenges and real-world engineering experience since 1986. Technical

kevinlinxc

import numpy as np
from multiprocessing import shared_memory

# Define global dimensions of 1080 video, would need to change this for a different camera resolution
w, h = 1920, 1080


class SharedMemImagePub:
    def __init__(self):
        # Create a named SharedMemory object